Steam-actuated valve



Patented May 15. 1894-.

llllll In (No Model.)

G. L. WELLER. STEAM AGTUATBD VALVE.

UNITED STATES PATENT OFFICE.

GEORGE L. WELLER, OF ELYRIA, OHIO.

STEAM-ACTUATED VALVE.

SPECIFICATION formingpart oi Letters Patent No. 519,826, dated May 15, 1894.

Application tiled February 3, 1894. Serial No. 499,036. (No model.)

`the claim.

`In the accompanying drawings-Figure l `is a perspective view of my new engine. Fig.

2 is a longitudinal section of the same. Fig. 3 1s a cross section through the center line of the valve. Fig. 4 is a section through the center line of the valve transverse to that of Fig. 3. Fig. 5 is a cross-section through the valve on line 5, 5, on Fig. 4.

A representsa cylinder.

B 1s a piston which I make with two heads and a little more than half the length of the cylinder, the piston rod C attached to one head of said piston and playing through the lower head of the cylinder. The middle portion of the piston is reduced in size to form two heads and for a special purpose hereinafter shown.

The valve which forms the principal part of my invention is described as follows:

D is a bed plate to which the cylindrical valve chamber Eis secured, and is cast with the cylinder on one side at its mid-length, and cross-wise to it. In the face of said plate are made the steam ports, e, e', e2, e3, and e4. The side ports e and e2 connect with passages in side of cylinder A which lead to the extreme ends and constitute the inlets. The ports es and e4 connect with shorter passages "in the side of cylinder A.

f f are small ducts leading from the cylinder into the ends of the valve chamber, the valve chamber also has like ports which register with those in the said plate D. G is a round valve playing in said chamber E. It

is also chambered as seen in Figs. 3 and 4, leavlng a central stem around which steam has access and renders it a balanced` valve, 5o the chambers also providing means for the steam to reach the ports.

H is a steam chest in the upper side of the valve chamber in communication with the end ports e', e2, and I is a pipe for conveying 55 steam-into said chest.

J is the exhaust pipe. y

K are cushions of rubber or other suitable material, covered by a thin plate of metal,

against which the ends ofthe valve Gstrike, 6o i to lessen the concussion. The working of this mechanism is as follows:-'l"he steam having been admitted under the piston, forces it upward until it passes small port f, allowing steam to enter 65 this port and pass through the channel into the valve chamber, and throw the valve to opposite end of the chest allowing steam to enter through valve at e2 and up through steam passage to upper end of cylinder, driv- 7o ing the piston down and allowing exhaust steam from lower end of piston to pass out through exhaust port e to open air. When piston has passed small port f', the steam enters through thatchannel into the other 75 l end of Valve chamber, throwing the valve back, allowing` steam to enter at e and exhaust through port ea and over out of exhaust `port e, thus repeating the operation,- giving to the piston a reciprocal movement, and to 8o the piston rod may be attached a drill bit.

It will beobserved', the cylinder has two steamm ports, e', e2, running to each end of cylinder, and also has an independent eX- haust port for each end of cylinder, e3, e4, 85 which are made shorter than the ports e', e2, the object of which is to cause the exitof exhaust steam to be shut off when the piston passes the ends 'of these ports causing the remainder of the steam to be `compressed and 9o acting as a cushion to prevent the piston from striking the ends ofthe cylinder.

The object of constructing the valve round, as shown, is to make it a balanced piston valve, having no pressure upon it to hold it 95 to its seat, thus allowing an easy and q'uick movement.

Having described my invention, I claim- In a rock-drilling steam engine, the coxnbered valve G playing in the transverse blnation of cylinder A having steam ports e, chamber E all constructed to operate sube e2 e3 e4, the two side ports e'and e2 constantiaily as described.

GEORGE L. WELLER. 5 ports e3 e4 connected with the 'shorter pas- WVitnesses:

Sages in the side of cylinder A; the ducts JOHN H. BOYNTON,

f', double headed piston B, and the cham- WESLEY WELLER.

nected with long passages, and the exhaust 

